Aviation Mechanic - General, Airframe, and Powerplant › III. Powerplant › Task C. Engine Inspection

AM.III.C.S1

Skill

Perform a compression check on a cylinder.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - Powerplant p. 11-23
Chapter 11: Light-Sport Aircraft Engines › General Maintenance Practices for the Light-Sport Jabiru Engines › Engine & Engine Compartment Inspection
clogged filter reduces engine performance, as well as promotes premature engine wear. The engine baffles and air ducts should be checked for condition and functionality. Two methods can be used to check the cylinders compression. The compression gauge method…
Aviation Maintenance Technician Handbook - Powerplant p. 10-39
Chapter 10: Engine Maintenance & Operation › Engine Troubleshooting › Valve Blow-By
prevent valve failure and possible engine failure by taking the following steps: 1. Perform a cylinder compression test to locate the faulty cylinder. 2. Check the valve clearance on the affected cylinder. If the valve clearance is incorrect, the valve…
Aviation Maintenance Technician Handbook - General p. 10-2
Chapter 10: Inspection Concepts & Techniques › Checklists
Checklists Always use a checklist when performing an inspection. The checklist may be of your own design, one provided by the manufacturer of the equipment being inspected, or one obtained from some other source. The checklist should include the following ... proper torquing and obvious defects. c. Internal engine—for cylinder compression and for metal particles or foreign matter on screens and sump drain plugs. If cylinder compression is weak, check for improper internal condition and improper internal tolerances…